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New Holley carb problem
#798439 November 12th 2022 4:01 am
Joined: Sep 2013
Posts: 66
Likes: 2
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journeyman
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Posts: 66
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Has anyone information on new Holley carbs running like the engine has an intake leak. I myself, and a couple of friends have all purchased new Holley (last 4 years) carbs, performed the install, and have high idle situations and no matter what we do the idle never changes. I am talking about 1500 -1700 rpm. Just wondering what if anything you guys have run into or info that you have found out. Holley of coarse says that it is an owner install problem. I know an auto repair shop owner that has been in business for 60 years is on his 3rd return of a Holley carb for his vette, his son the same problem on a carb for his mustang. Just wondering what if anything you guys have run into?

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Re: New Holley carb problem
Randy Charles Hill #798440 November 12th 2022 8:21 am
Joined: Jan 2014
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No sir, the newest one I've purchased was about 5 years ago, and it's been doing fine. I've currently got it on my 82 G10 with no issues. I would call their tech helpline and be persistent that they help you through the issue. They're usually really good about helping out, at least they have been with any problems I've had over the years.

Are you 100% certain you don't have an intake gasket leak? Only reason I ask is when I installed my newest Holley on a 1968 K10 I initially bought it for, it did that as well and I did in fact have an intake leak. I replaced the intake gaskets and my problem was solved.


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Re: New Holley carb problem
kursed #798449 November 12th 2022 11:40 am
Joined: Sep 2013
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journeyman
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Yes sir, The carb that I replaced was a Holley street avenger and it worked fine. It was 12 years old and I just thought that I better put a new one on while I can still find a carb for my 76 G20. Every thing was fine as it was, bought a new 4150 600 cfm, replaced the intake gasket (as usual) put the carb on and idle went to 1400 and could never get it down. I then replaced all air lines, air caps, replaced the gasket again, started it up same problem did not change anything on idle. The owner of Coopers Garage locally had the same problem with a new Holley of a Mustang rebuild, his dad the owner for 60 years has a 60s vette, put a new Holley on it, same thing, twice after retuning the carb. I gave my new carb to a manager at the local Oreilly's auto parts and I bought another Street avenger 570 cfm exactly like the one that I was replacing. Replace the carb (new gasket) fired it up same problem. Tempted to put the original back on, start it up and see what happens. The cold temps just came to Detroit area so any carb swap may not happen for a while, I do not want to do the work again, but if I put the old one back on and it works fine then I know that it is the new Holley.

Re: New Holley carb problem
Randy Charles Hill #798450 November 12th 2022 3:06 pm
Joined: Mar 2011
Posts: 513
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My only complaint about the new Holley carbs are they have a very fast high idle out of the box. Is the choke working? One nice thing about having a van, if it runs you can warm it up a bit and work from the inside. Getting from the door to the van not soo much.


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